光源整理

main.cpp

@@ -99,9 +99,10 @@ INT WINAPI WinMain(_In_ HINSTANCE hInstance, _In_opt_ HINSTANCE hPrevInstance, _
 	float ambientMaterial[] = { 0.2f,0.2f,0.2f,1.0f };
 	float diffuseLightColor[] = { 1.0f,1.0f,1.0f,1.0f };
 	float diffuseMaterial[] = { 0.6f, 0.6f, 0.6f, 1.0f };
-	float lightPos[] = {0.0f,1.5f,-3.0f,0.0f};
-	float spotLightDirection[] = {0.0f, -1.0f, 0.0f, 64.0f};//把最后一位改成......
-	float spotLightCutoff = 30.0f;
+	float lightPos[] = {0.0f,1.5f,-3.0f,1.0f};
+	
+	float spotLightDirection[] = {0.0f, -1.0f, 0.0f, 110.0f};//把最后一位改成......
+	float spotLightCutoff = 15.0f;
 	float specularLightColor[] = { 1.0f,1.0f,1.0f,1.0f };
 	float specularMaterial[] = { 1.0f,1.0f,1.0f,1.0f };
 	float eyePos[] = { 0.0f,0.0f,0.0f };

res/shader/test.fs

@@ -15,50 +15,46 @@ varying vec3 V_WorldPos;
 
 void main()
 {
-	//角度转弧度
-	float radianCutoff = U_Cutoff * 3.14 / 180;
-	float cosThta = cos(radianCutoff);
-	vec3 spotLightDirection = normalize(U_LightDirection.xyz);
+
+	//common 
+	vec3 N = normalize(V_Normal);
 
 	//ambient
 	vec4 ambientColor = U_AmbientLightColor * U_AmbientMaterial;
 
 	//diffuse
 	vec3 L = vec3(0.0);
-	float distance = 0.0;
 	float attenuation = 1.0;
-
-	//light attribute
+	float diffuseIntensity = 0.0;
+	if(U_LightPos.w == 0 && U_Cutoff == 0){
+		// 平行光
+		L = normalize(U_LightPos.xyz - vec3(0.0));
+	} else {
+		// 点光
+		L = normalize(U_LightPos.xyz - V_WorldPos);
+		float distance = length(U_LightPos.xyz - V_WorldPos);
 		float constantFactor=0.5;
 		float linearFactor=0.3;
 		float expFactor=0.1;
-
-	if(U_LightPos.w==0.0){
-		//这是方向光
-		L = normalize(U_LightPos.xyz);
-	} else {
-		//这是点光源
-		//model point -> light pos
-		L = normalize(U_LightPos.xyz - V_WorldPos);
-		distance = length(U_LightPos.xyz - V_WorldPos);
 		attenuation = 1.0 / (constantFactor + linearFactor * distance + expFactor * distance * distance);
-	}
 
+		//角度转弧度
+		float radianCutoff = U_Cutoff * 3.14 / 180;
+		float cosThta = cos(radianCutoff);
+		vec3 spotLightDirection = normalize(U_LightDirection.xyz);
+		float currentThta = max(0.0, dot(-L, spotLightDirection));
 
-	L = normalize(-L);
-
-	vec3 N = normalize(V_Normal);
-
-
-	float currentCosThta = max(0.0, dot(L,spotLightDirection));
-
-	float diffuseIntensity = 0.0;
-	
-	if(currentCosThta > cosThta){
-		diffuseIntensity = pow(currentCosThta, U_LightDirection.w);
+		if(currentThta > cosThta){
+			diffuseIntensity = pow(currentThta, U_LightDirection.w);
+		}
 	}
 
-	vec4 diffuseColor = U_DiffuseLightColor * U_DiffuseMaterial * diffuseIntensity * attenuation *4.0;
+	vec4 diffuseColor = U_DiffuseLightColor * U_DiffuseMaterial * max(0.0, dot(L,N)) * attenuation * diffuseIntensity;
+
+	//specualr
+	vec3 RD = normalize(reflect(-L,N));
+	vec3 VD = normalize(U_EyePos - V_WorldPos);
+	vec4 specularColor =  U_SpecularLightColor * U_SpecularMaterial * pow(max(0.0, dot(RD,VD)) ,128);
 
-	gl_FragColor = ambientColor + diffuseColor;
+	gl_FragColor = ambientColor + diffuseColor + specularColor;
 }